Precision angle and internal taper gauge



March 6, 1951 c. T. OLSON 2,544,469

PRECISION ANGLE AND INTERNAL TAPER GAUGE Filed March 20, 1947 2 SheetsSheet l Im'eutor Carl TI Olson Attorneys March 6, 1951 c. T. OLSON 2,544,469

PRECISION ANGLE AND INTERNAL TAPER GAUGE Filed March 20, 1947 2 Sheeis-Sheeu 2 Fig. 5.

Distance Bar Se Hing Carl 7T Olson Patented Mar. 6, 19 51 RECIS ON AND INTERNAL TAPER AUGE,

per cent tcHugoW. NahiyMonessen, Pa.

Application March 20, 1947, Serial No. 735,867

31Gla-imjs. 1

The presentinvention relates generally to pre.

cision tools for the use of machinists, and more particularly to a metering gage for measuring in-.

ternal tapers, that is, the taper of a bore or hole, while the tool is held against the end. of the work bein measured, the tool being also adapted for measuring external angles.

An object of this invention is to provide a tool which will facilitate the measurement, of the taper in abore, the tool being adapted for the insertion thereinto of anvils of diiferent lengths, so that both obtuse and acute; angles may be measured, and the taper of a bore can be measuredfrom either end of said bore, it being understood that this tool is primarily adapted for measuring angles and tapers where a fiat face is provided on the Work, the flat face of the body portion of the tool being placed on thevfiat face of the work while the measurement is being .made.

Another object of this invention is to provide ametering tool of this character whichwill provide direct measurements of the two dimensions giving the tangent of the angle in the taper; with the tangent known, the machinist may work directly from these values or he may obtain the value of the angle by reference to tables of trigonomical functions.

Anotherobject o f'this invention is to provide a device of this character for use in measuring exterior angles, the two anvils being placed on one side of theobject to be measured and the flat face oi -the body portion of-the toolbeing pl'acedon anotherside, the angular disposition of these two sides beingcalculated in a mannerverysimilar to that describedabove.

Another object ofthis invention is to provide a tool 'of-thischaracter which, by reason of its structural design, is very rigid and dependable in use,

Still another object of this invention is-to provide at'ool which can beadlusted inia very simple manner, to obtain a precise zero setting of the toolprior to making a measurement'therewith.

And a last object to be specifically mentioned is toprovide a tool of this character which is relatively inexpensive and practicable to manufacture, simple and" convenient to use, easily understood and which will give generally efficient and; durable service.

With these and other-objects definitelyin view, thisinvention resides in certain novel features of construction, combination andarrangement of parts and portions as will be-hereinafter described in detail and particularly set forth in thepappended claims, reference being had'to the accompanyingdrawings which form a material part of this application, and in which:

Figure 1 is a perspective view of the assembled tool;

Figure 2 is a horizontal sectional view, taken on. the line 22 in Figure 1;

Figure 3 is a transverse vertical sectional view, taken on the irregular section line 3-3 in Figure 1:;

Figure 4: is a perspective view of the travellerand the anvil secured thereon;=

Figures 5 and 6 are diagrammatic views, adaptedto illustrate how-this tool is used to measure the tapers of bores which have increased and decreased diameters toward the face whereon the tool is placed, respectively, the figures also illustrating how an obtuse angle and an acute angleon the exterior of an object may be measured. V

Similar characters of'reference designate similar or identical parts and portions throughout the specification and throughout the several views of the drawings.

Referring now to the drawings in detail, it will bench d that this tool includes a body portion, generally represented by the numeral It, an adjustably mounted anvil l2, a micrometer gage generally represented by the, numeral [4 and adapted to provide for metered adjustment, of the anvil 12, a distance bar It slidably mounted inthe body portion liland adistance bar anvil I8.

The body portion I0 is of unitary character comprising a generally rectangular block 20, vertioa'llydisposedportions 22 and 24 and a right angularly. disposed portion 26, the portions22, 24 and 26 having a common flat face which will be hereinafter-referred to as the face 28 of the body member, The anvil I2 comprises the terminal member of'a downwardly inclinedfinger 30 which is integralwith the traveller block 32, thistravellerblock being generally rectangular in, shape and thesaid finger being preferably tapered asillusr, trated. A pair; of vertically disposed parallel traveller guide bars 374 are terminally secured in the; upper face of the; rectangular portion 20. and in the lower face of the transversely disposed bar 3-6, which is secured by any'suitable means, as-

illustrated at 38, to the upper end of'thebody portionji, it being'understood that the traveller block 32 is provided with spaced and carefully machined bores'to receive the parallel guide bars 3.4,, The traveller block 32 is provided with a boss: member. 410 which is drilled and tapped to receivetheadjustment screw 42, the lower end of whichiis adapted "to abut the upper end of thespindle M, which spindle is secured to the thimble 46, according to the substantially standardized practice in the construction of micrometer gages. A sleeve 38, calibrated as at 58, is threadedly associated with the thimble 46 and is rigidly secured to a boss 52 on the outer face of the portion 2!], this boss 52 being drilled to receive the spindle 44. Obviously, the boss 40 and the boss 52 must be arranged so that the upper end of the spindle 44 will contact the lower end of the adjustment screw 42.

The distance bar it may be cylindrical or otherwise shaped and is slidably associated in a bore provided therefor disposed longitudinally through the rectangular portion 20, this bore for the distance bar [6 being disposed at right angles to-the face 28. If the distance bar I6 is cylindrical, a

' may be considered the lines 69 and 62.

4 be noted, however, that the distance bar setting must now be considered as the length of the line from the inside edge of the anvil l8 and the curved upper inner edge of the anvil 12. If preferred, a plurality of scales may be added to the distance bar it, the indicia of these scales not being illustrated in the drawings, since the operation of this tool is not dependent thereon and measurement of the distance bar setting can easily be obtained by a scale, that is, by a simple graduated scale of the type which machinists use regularly.

Figure 5- also represents how this tool may be used to measure the exterior angle between faces of a body which, for purposes of this explanation, In this case, the face IU of the tool is made to rest upon the face 60 and the anvil I8 is made to abut the groove 54 on one side thereof is provided to co-act 7 g with the point of a set-screw 55 which is used to lock the distance bar at any predetermined posi tion relative to the body I3. At the outer end of the distance bar, the anvil i3 is secured thereto by a set-screw 58, and it should be noted that this anvil is replaceable, being one of a set of anvils of similar character but of different lengths, the drawings showing two such anvils which are used interchangeably, as hereinafter described.

It will be understood that many useful modifications may be made in. the, exact form of the different elements of this invention, for example, the body it may be considerably varied in shape, the traveller 32 could be mounted otherwise than on the guide bars 35 and a dial indicator might be substituted for the micrometer gage hi, all without departing from the spirit and scope of this invention. A similar change might be made in the method of attaching the micrometer sleeve 48 to the boss 52, the method illustrated in Figure 3 wherein a portion of this sleeve is exteriorly threaded to facilitate such attachment representing only one of many simple ways of mounting the micrometer gage on the device.

The operation of this invention will be reasonably clearly understood from a consideration of the foregoing description of the mechanical details thereof, taken in connection with the drawings and the above recitation of the objects sought to be achieved by this invention, but if reference is had to Figure 5 and 6, examples of the use of this tool may be more clearly understood. In Figure 5, the line as may be thought of as representing the-tapered surface of an object with the tapered bore therein and the line 82 represents the flat face of this object. When the face 28 of the tool is made to rest upon the face 62 of the work, while the anvil i8 is made to abut thesurface 60 with a proper degree of pressure or feel, the anvil I2 is moved by turning the thimbie 65 until this anvil contacts the surface 66. The distance bar it has been set so that the length illus trated in the drawing as the distance bar setting is a reasonable dimension and adapted for easy calculation, and the micrometer reading is taken to give the vertical distance from the top of the anvil [8 to the outside of the anvil i2, these two dimensions will give the tangent of the angle abc directly. If the angle need be known in degrees it can be determined by reference to tables of trigonometrical functions. Figure 6 represents how the angle of a taper, such as in a tapered bore where the diameter of the bore is less at the face 52 than is the diameter farther within the bore, in this case, the longer anvil I8 being secured to the distancebar l8, and the readings taken substantially as before. It should face 62.

The reading of the micrometer, that is, the length l8, divided by the distance bar setting bc will give the tangent of the angle ab '-c,

or this same calculation will give the co-tangent of the angle ba-c which is the obtuse angle" on the outside of the object being measured, cotangent tables then being used as the simplest method of obtaining the angle at the edge of the object. Similarly, when the angle to be measured Though there has been shown a particular em bodiment of this invention, this application is not limited to this particular embodiment, but it is, desired to include in the scope of this invention the construction, combination and arrangement of parts and portions substantially as set forth in the appended claims.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

l. A precision tool comprising a body member having a flat face, an anvil projecting beyond said face and slidably mounted on said body member for movement along said face, a gage mounted on said body member and operatively connected with said anvil for metering said movement, a distance bar extending normal to said face and slidably mounted on said body member for metered adjustment in a direction normal to said face, and an anvil on the outer end of that part of said distance bar extending from said face, said first mentioned anvil being on a traveller, and said traveller being slidably associated with parallel traveller guide bars secured on said body portion.

2. A precision tool comprising a body member having a fiat face, an anvil projecting beyond said face and slidably mounted on said body member for movement along said face, a gage mounted on said body member and operatively connected with said anvil for metering said movement, a distance bar extending normal to said face and slidably mounted on said body member for metered adjustment in a direction normal to said face, and an anvil on the outer end of that part" of said distance bar extending from said face; said second mentioned anvil being a rod remov-' ably mounted on said distance bar angularly disposed thereto.

3. A precision tool comprising a body member having a flat-face, an anvil projecting beyond said face and slidably mounted on said body member for movemeftfalong said face, a gage mounted on said bod fmember and operatively connected with said anvil for metering said movement, a distance bar extending normal to said face and slidably mo'i inted on said body member for metered adjustment in a direction normal to said face. and an anvil on the outer end of that part of said distance bar extending from said face, said first mentioned anvil being 0 1 @j traveller, and said traveller being slldably associated with parallel traveller guide bars secured on said body portion, said traveller having an adjustment screw 1| for adjusting said traveller and first mentioned anvil with'fireference to said gage.

CARL T. OLSON.

announces CITED following references are of record in the file 'foI this patent:

UNITED STATES PATENTS I Name I Date g Schmidt (g t; 15, 1889 1939,?01 Constantinescu {Oct. 1, 1912 150 91703 Bourgeois Sept. 23, 1924 ;f FOREIGN PATENTS Nuilg Country Date 5541 Germany -Jfgjeb. 26, 1924 238,706 Switzerland (W. 16, 1945 a 3 OTHER REFERENCES? fiirnerican Machinist, page 5'73, Apr. 9, 1931. 

